What is Bangers & Mash?
1.
Human excrement deposited onto train tracks when passengers flush the train toilet while the train is at the station.
A pile of moist toilet paper (resembling mashed potatoes) with a deposit of human excrement (resembling a sausage) protruding from this.
The pile of 'Bangers & Mash' on the tracks at Platform 8, Reading Station is a particularly striking specimen.
See